Deputies detained a 14-year-old boy Friday morning after he allegedly shot another Highland High School student in the arm.
"Unfortunately, that may be a result of why we were able to to put an end to this so quickly was this rapid deployment and rapid response", said Capt. Darren Harris of the Los Angeles County Sheriff's Department.
The victim had been stabbed at least once in the upper torso, Schrader said.
The school remained on lockdown Friday morning as school officials worked to reunite students with their parents.
The sheriff's office also tweeted that they investigated reports of shots fired near Manzanita Elementary School located about seven miles from Highland High School but the campus and school was clear.
"Deputies responded immediately to Palmdale shooting, arrest made, weapon found, active investigation underway".
The 911 calls included reports that hostages were being held in the school library, Los Angeles County Sheriff Jim McDonnell said in a press conference Friday afternoon.
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Faculty also provided surveillance video of the suspect arriving and leaving the school, which "assisted in the quick apprehension" of the suspect, McDonnell said.
Lydia Gilbert, a junior at Highland, said her mother was dropping her off when a student ran up and warned her there was a shooting. Meanwhile Antelope Valley Hospital was told several people were dead and as many as 25 students were injured, said Dr. Pavel Petrik, the trauma center's chief of surgery.
"So I called the school and his teacher was crying, but she said everything was fine and he was fine", Guzman said.
In the end, there was just one shooting and one victim, at Highland High School, about 40 miles (64 kilometers) northeast of Los Angeles. The sheriff's department said deputies were on scene searching the campus, and the Highland principal tweeted that people should "stay clear of campus" while authorities assessed the situation.
The off-duty officer, who works for Los Angeles police, then detained the teen. "Thankfully we only had one child that was shot".
"He looks back at me and tells me to run", he said. He is a former student who recently transferred to another school, the sheriff added.